👉 The answer to your question is 'santana flooding.' It refers to a literal flood of traffic, especially during rush hour when most people are driving, that occurs when the city's streets fill up with cars and trucks pouring out like a giant sea. The example sentence would be:
"San Antonio was flooded in the middle of the night after it rained heavily throughout the day, leaving roads so congested that cars had to wait hours for a spot on the side of the road where they could park."
